Improvement in planing-machines



to the cutter-cylinder.

UNITED STATES PATENT OFFICE.

SOLOMON A. WOODS, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN PLANING-MACHINES.

Specicaton forming part of Letters Patent No. 144,588, dated November 11, 1873 application filed June 19, 1873.

To all whom t may concern:

Be it known that I, SOLOMON A. WOODS, of Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Planing-Machines; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specication, is a description of my invention sufficient to enable those skilled in the art to practice it.

In my invention, I combine with the frame in which the roll is mounted a guide bar, which moves with the frame, but is stationary as regards the roll, the inner edge of said bar standing near the roll, and a little above the horizontal plane of the bottom of the roll, and the bottom face of the bar inclining upward from said edge, so that the end of any board in approaching the roll (if said board be thicker than the distance from the bottom 0f the bar to the table upon which the board is laid) will ,strike the inclined face of the bar, and will reach the roll under the guidance of the bar instead of striking the roll squarely, the intervening guide-bar rising and bringing the top surface of the board directly under the bottom of the roll, or nearer to the plane of the bottom p of the roll than to a plane with the axis thereof, the roll and bar moving as one in the arc of a circle, so that they maintain, or approximately maintain, their position jointly with reference At the opposite side of the roll is the chip-breaker, which is so con `structed and arranged that, while its edge stands close to the path of rotation of the cutter-edges, its bottom surface is just above the plane of the bottom surface of the presser-roll, the board passing under the roll and the bar, but the roll holding the bar just above the surface of the board or out of contact therewith.

`This baralso moves in the arc of a circle with the roll.

The drawing represents, in sectional elevation, a mechanism embodying my invention.

a denotes the frame-work of the machine. I is the cutter-head, or cylinder, having jourw nais c mounted in suitable boxes d. Pivoted to the journals c, or at other suitable points with reference to the cuttercylinder, is a frame, f, which carries the presser-roll g, this roll having journals pivoted in the frame. At the front of the roll is the guide and roll-protector bar h. The front edge of this bar is positioned, with relation to the roll, substantially as seen in the drawing, the bottom or acting face of the roll projecting below the bar, and the bottom face of the bar inclined upward, as seen at Fig. l.` If a thick board approaches the cutter-cylinder, and there be no bar intervening between it and the roll, it will be obvious that the impact of the end of the board against the roll will tend to force the roll ahead instead of to simply cause it to take the board beneath it; and, if a presserbar alone be employed without a roll, there is too great friction between the bar and the surface of the board. For these reasons,I employ the guide-bar, constructed and arranged as shown, the bottom face of said bar being struck by the end of the board, and the frame being thereby raised, the bar then guiding the board under and to the action of the roll, as will be readily understood. t denotes the chipbreaker xed to or forming part'of the frame f. The bottom surface of thisibar stands just `above the top surface of the board, as seen in Fig. 2, the roll, and not the bar, bearing upon the surface of the board, the only friction on the top of the board being the rolling friction of the roll. By using the protector-bar h, a roll of much smaller diameter may be employed, thereby enabling the roller to be placed much nearer the path of rotation of the cutting-edges than when a roll of large diameter is employed, it being desirable to get the presser-roller as near as possible to the lifting action of the knives.

I claim- A cutter-cylinder, iu combination with the frame f, its bar 'i h, and the roller g, substantially as shown and described.

FRANCIS GoULn, M. W. FROTHINGIIAM. 

